<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <!-- <img src="../assets/logo.png" alt=""> -->
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
        <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button"  @click="toggleCollapse">
            <i :class="isCollapse ? 'el-icon-s-unfold' : 'el-icon-s-fold'"></i>
        </div>
        <!-- 侧边栏菜单 -->
        <el-menu
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span>{{item.authName}}</span>
            </template>
             <!-- 二级子菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
            :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{subItem.authName}}</span>
                </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 主体结构 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
 data() {
    return {
      // 左侧菜单数据
        menulist: [],
        iconsObj: {
            '125': 'iconfont icon-user',
            '103': 'iconfont icon-tijikongjian',
            '101': 'iconfont icon-shangpin',
            '102': 'iconfont icon-danju',
            '145': 'iconfont icon-baobiao',
        },
        isCollapse: false,
        activePath: 'false'
    }
 },
 created() {
  // 在created阶段请求左侧菜单数据
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
 },
  methods: {
    //退出到登录页面
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/mylogin");
    },
    async getMenuList() {
      // 发送请求获取左侧菜单数据
        const { data: res } = await this.$http.get('menus')
        if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        //console.log(res);
    },
    //侧边栏伸缩
    toggleCollapse() {
        this.isCollapse = !this.isCollapse
    },
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  background-color: #333;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: rgb(84, 92, 100);
  transition: all .5s;
    .el-menu {
        border: 0;
    }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
    margin-right: 10px;
}
.toggle-button {
    font-size: 24px;
    height: 24px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>